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<operating system> (JES) An IBM mainframe term. There are really two JESs. JES2 is smaller and simpler, and can handle 99.99% of most jobs that run on IBM's MVS operating system. JES3 is much bigger and requires really big iron to run.
(1996-03-23)
Nearby terms: jo « job « Job Control Language « Job Entry System » Jobs » job security » jock
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